Question: Who did C.S. Lewis marry  on 1-1-1956?
Paraphrase: 1-1-1956 was the date on which C.S. Lewis was wed to whom?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q9204 p:P26 ?s . ?s ps:P26 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1956')) }